<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
			function move({x=0,y=0} = {}) {
				return [x,y];
			}
			console.log(move({x:3,y:8}));//[3,8]
			console.log(move({x:3}));//[3,0]
			console.log(move({}));//[0,0]
			console.log(move());//[0,0]
		</script>
	</body>
</html>
